Webster's English Dictionary

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sustenance

sus.te.nance \'s*s-t*-n*n(t)s\ n [ME, fr. OF, fr. sustenir] 1a: means of 
   support, maintenance, or subsistence : LIVING  1b: FOOD, PROVISIONS; also : 
   NOURISHMENT  2a: the act of sustaining or the state of being sustained  2b: 
   a supplying or being supplied with the necessaries of life  3: something 
   that gives support, endurance, or strength